128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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* Copyright (C) 2022 Christoph Hellwig.
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*/
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#ifndef BTRFS_BIO_H
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#define BTRFS_BIO_H
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#include <linux/bio.h>
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#include <linux/workqueue.h>
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#include "tree-checker.h"
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struct btrfs_bio;
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struct btrfs_fs_info;
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#define BTRFS_BIO_INLINE_CSUM_SIZE 64
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/*
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* Maximum number of sectors for a single bio to limit the size of the
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* checksum array. This matches the number of bio_vecs per bio and thus the
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* I/O size for buffered I/O.
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*/
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#define BTRFS_MAX_BIO_SECTORS (256)
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typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio);
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/*
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* Additional info to pass along bio.
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*
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* Mostly for btrfs specific features like csum and mirror_num.
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*/
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struct btrfs_bio {
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unsigned int mirror_num:7;
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/*
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* Extra indicator for metadata bios.
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* For some btrfs bios they use pages without a mapping, thus
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* we can not rely on page->mapping->host to determine if
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* it's a metadata bio.
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*/
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unsigned int is_metadata:1;
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struct bvec_iter iter;
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/* for direct I/O */
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u64 file_offset;
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/* @device is for stripe IO submission. */
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struct btrfs_device *device;
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union {
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/* For data checksum verification. */
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struct {
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u8 *csum;
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u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
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};
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/* For metadata parentness verification. */
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struct btrfs_tree_parent_check parent_check;
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};
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/* End I/O information supplied to btrfs_bio_alloc */
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btrfs_bio_end_io_t end_io;
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void *private;
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/* For read end I/O handling */
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struct work_struct end_io_work;
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/*
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* This member must come last, bio_alloc_bioset will allocate enough
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* bytes for entire btrfs_bio but relies on bio being last.
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*/
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struct bio bio;
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};
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static inline struct btrfs_bio *btrfs_bio(struct bio *bio)
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{
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return container_of(bio, struct btrfs_bio, bio);
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}
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int __init btrfs_bioset_init(void);
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void __cold btrfs_bioset_exit(void);
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struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
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btrfs_bio_end_io_t end_io, void *private);
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struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size,
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btrfs_bio_end_io_t end_io, void *private);
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static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status)
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{
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bbio->bio.bi_status = status;
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bbio->end_io(bbio);
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}
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static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio)
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{
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if (bbio->is_metadata)
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return;
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if (bbio->csum != bbio->csum_inline) {
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kfree(bbio->csum);
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bbio->csum = NULL;
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}
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}
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/*
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* Iterate through a btrfs_bio (@bbio) on a per-sector basis.
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*
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* bvl - struct bio_vec
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* bbio - struct btrfs_bio
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* iters - struct bvec_iter
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* bio_offset - unsigned int
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*/
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#define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \
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for ((iter) = (bbio)->iter, (bio_offset) = 0; \
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(iter).bi_size && \
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(((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \
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(bio_offset) += fs_info->sectorsize, \
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bio_advance_iter_single(&(bbio)->bio, &(iter), \
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(fs_info)->sectorsize))
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void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
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int mirror_num);
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int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
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u64 length, u64 logical, struct page *page,
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unsigned int pg_offset, int mirror_num);
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#endif
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